Question about Cobra 29 LTD CB Radio

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Red light on antenna

Mack factory mounted coax and antennas with a new cobra29LTD Chrome. No light sitting still, red light when i move truck

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Mack's cophased harness just merges the two wires at the connector going to your radio. If the radio falls out of compartment and is caught by the coax it could damage this connection. Outer shield and inner lead could short here. I have replaced many a final due to bad coax for my company which primarily Mack. Well i say that but it is the beloved company driver that continues to talk on a bad antenna system. It actually take a while to kill a final even with out an antenna attached. Good Luck...........

Posted on Jun 18, 2014

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Posted on Jan 02, 2017

Shuttle83
  • 1139 Answers

SOURCE: CB transmission

Hello 64driver,

Make sure the radio is grounded properly and that the SWR is around 1.2:1, 1.3:1 is good but try to get it to 1.2:1. Also take a power output reading while keying the mic. To do this with your power meter put it in-line with the CB and your antenna and key the mic you should get about 4 to 5 watts PEP. If this is the case your unit is putting out the proper power level, if not have the power amplifier checked by a qualified repair shop.

I hope this helps

Shuttle83

Posted on May 14, 2008

  • 773 Answers

SOURCE: i set the swr on my antenna and it keeps moving i

1) if you are talking, your SWR will most likely move. You must take the reading while not modulating, (talking into the mic)

2) Window mount antenna's are GARBAGE. they are worthless. BAD BAD BAD. You wasted your money. Get a mag mount.

3) if you are not in an open lot, your SWR's will be different due to structures reflecting signal back. Always take your SWR reading in an open lot.

4) You could be experiencing Common mode currents. Normally the signal travels on the inside of the coax ground. Common mode current is when the signal is traveling back down the coax on the outside of the ground in the coax. (The biggest cause of this would be the window mount antenna). If you want to keep that garbage antenna, then you can make an RF choke in the coax. The best solution is get a better antenna. Here is how to make the choke. As close to the antenna as you can, take 6 ft of coax and loop it uniformly laying each coil next to the other. use electrical tape to hold it in place. You want 6-8 wraps. You want a nice uniform coil.


Just get a better antenna. Window mounts are the worst. You get horrible receive and horrible transmit. Get a wilson 500 mag mount. It will work so much better for you.

Posted on Apr 24, 2009

  • 12 Answers

SOURCE: The radio has no sound but the needle moves

Sounds like bad external speaker

Posted on Jan 25, 2010

  • 1274 Answers

SOURCE: Red RX/TX and red ANT light on my CB

Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...

Posted on Mar 12, 2010

Testimonial: "Thx the rx/tx light is supposed to turn red I found out. Still trying to get the antenna prob fixed though."

  • 1274 Answers

SOURCE: cb radio

As for me ,the Wilson 1000 or Wilson 2000 are the best mobile antenna for a mobile. I have out talked a lot of base antennas with them, just put it on the top of car in the center or trunk, or middle of cab of truck, with a good SWR and you are talking and receiving. great antenna. ...hope this helps..

Posted on Jun 02, 2010

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there are two lights for the antenna.when you are transmitting the top light will change from green to red the bottom shouldn't be on.this is the awi light. it means there is a problem with the antenna system, and you should get it checked. It could be the antenna swr ,bad coax,or the radio.Since you can't do anything with the coax or radio it has to be done with the antenna. Get a real SWR meter and check the SWR or have a tech do it. If the SWR is ok then your antenna just might be in the wrong spot ,or it may need to be grounded A tech will tell you the problem as soon as he puts his meter on it.

Apr 17, 2014 | Cobra 29 LTD CB Radio

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First thing is to be sure the mount is not shorted in any way--and also to make sure that where it is mounted it is actually connected to ground--many newer vehicles have insulators so a bumper even if metal has no ground to work off of.

No ground, open or short in coax, open or short in mounting bracket all can cause no swr or high swr.

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I have a wilson 5000 mirror mount. I mount it on the drivers side mirror on the upper cross arm that goes to the mirror. It is mounted on this arm with a bracket and a so 239 connector so I can undo it if I have to ,leaving the antenna connected.I can change coax and not have to worry about undoing the antenna. Remember one thing. The antenna has to be checked for SWR.each time you move it to a different spot or to a different truck.

Oct 11, 2011 | Cobra 29 LTD CB Radio

1 Answer

When i key my mic my antenna light comes on. i have tried 2 different antennas and it still does it. what can i do to fix it?


The problem is most likely the coaxial cable.
A ground problem can cause this problem. Coax connection and bottom of antenna lug mounted should be in contact with mount's base. Antenna should not touch mount there is a insulator between them that antenna shaft passes thru. Mount must have a metal grounded mount location is a electrical circuit also.
Check SWR with the meter in radio. The ant light circuit could be out of alignment from factory.

Aug 16, 2011 | Cobra 29 LTD CB Radio

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29 ltd classic won't receive good when switch to Cal or swr an key up meter don't move


This could be an antenna related problem. Check the PL-259 connector (spin on antenna connection for antenna coax to radio) and make sure it is made up hand tight. Inspect the antenna's base. If mounted to metal, make sure the mechanical connection is tight - and rust free. Rusted parts provide a poor electrical connection. If a mag mount, make sure is is sitting on the flattest part of the surface.

If these suggestions are not providing the expected results, you might need to tune the antenna. If you never tuned the antenna, then you definitely need to tune the antenna. The complete procedure can be found here. The antenna should be checked / tuned after each time it is moved to maintain maximum performance.

Good luck!

Oct 18, 2010 | Cobra 29 LTD CB Radio

1 Answer

I have cb hooked up to antena and power i think its hooked up right but when i key mic both lights on right hand side of cb turn red . plus when i try to tune swr with the manual the swr needle will not...


Sounds like a problem with your coax cable. You may not have the ends on the cable properly or the cable may have a kink or short in it somewhere. That is a sign of a very high SWR and usually means a short somewhere. If it is a mobile antenna make sure the little plastic washer on the antenna mount is installed properly. It is meant to insulate the antenna center conductor from the metal it is mounted to. It goes on top of the bracket and has a little raised collar on one side which should sit in the hole on the bracket.

Feb 03, 2010 | Cobra 29 LTD CB Radio

1 Answer

I set the swr on my antenna and it keeps moving i have a cobra 19 dx iv and i just installed a net window mount antenna 27" on my back window that has factory tint.


1) if you are talking, your SWR will most likely move. You must take the reading while not modulating, (talking into the mic)

2) Window mount antenna's are GARBAGE. they are worthless. BAD BAD BAD. You wasted your money. Get a mag mount.

3) if you are not in an open lot, your SWR's will be different due to structures reflecting signal back. Always take your SWR reading in an open lot.

4) You could be experiencing Common mode currents. Normally the signal travels on the inside of the coax ground. Common mode current is when the signal is traveling back down the coax on the outside of the ground in the coax. (The biggest cause of this would be the window mount antenna). If you want to keep that garbage antenna, then you can make an RF choke in the coax. The best solution is get a better antenna. Here is how to make the choke. As close to the antenna as you can, take 6 ft of coax and loop it uniformly laying each coil next to the other. use electrical tape to hold it in place. You want 6-8 wraps. You want a nice uniform coil.


Just get a better antenna. Window mounts are the worst. You get horrible receive and horrible transmit. Get a wilson 500 mag mount. It will work so much better for you.

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You Need to check and set you SWR on the antenna system. You may also have a bad coax or the ant studs ( mounting hardward ) for the antennas may be bad. It definally sounds like an ant/coax problem Good Luck
Ed
NC Electronic
Mills, Wyoming

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